James Holmes, the man accused of killing 12 people and injuring dozens more in last week's movie theater shooting, reportedly sent plans of how he was going to kill people to a shrink before the attack.
The notebook sat unopened in a mailroom for up to a week before its discovery Monday, a law enforcement source told FoxNews.com.
According to Fox News, Police and FBI agents were originally called to the University of Colorado Anschutz medical campus in Aurora on Monday morning after the psychiatrist, who is also a professor at the school, reported receiving a package believed to be from the suspect. It turns out the original package was not from Holmes. Police then searched the mail room and found a package that was addressed to the psychiatrist with Holmes' name in the return address.
According to the New York Daily News, a source revealed that in the package was a journal filled with Holmes' plans. “There were drawings of what he was going to do in it — drawings and illustrations of the massacre."
It was not revealed why Holmes chose to send the notebook to the psychiatrist in question.
More from GlobalPost: James Holmes spits at guards (VIDEO)